On the Contribution of Electric-Type Current Patterns to UISNR for a Spherical Geometry at 9.4 T

Parallel imaging is intrinsically limited by Maxwells
equations. A complete set of vector solutions to the
Helmholtz equation consists of both curl-free and
divergence-free fields. In this study we investigated
the contribution of electric-type current patterns to
UISNR for different voxel positions and acceleration
factors in a spherical model at 9.4T. For moderate
acceleration the electric mode increased UISNR by
maximally 55%. For very high acceleration, however,
UISNR was mostly caused by the magnetic mode. The reason
for this might be the much faster growing power loss of
the electric mode with respect to the expansion order.

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